MathNet 2026 — Part 01 Question 100

The triangle $ABC$ is isosceles base $BC$ and $\angle BAC = 48^\circ$. Points $D$ and $E$ are on the sides $AB$ and $AC$, respectively, such that $\angle DAC = 9^\circ$ and $\angle EBC = 33^\circ$. Determine the measure of angle $CDE$.